Door latch lock



Sept. 25, 1956 H; M. MARKO DOOR LATCH LOCK 2 Sheets-Sheet 1 Filed Dec. 29, 1954 Fla. 2

' INVENTOR. HAROLD M. Mnezo BY @M/,M

A TTOPNE Y5 H. M. MARKO DOOR LATCH LOCK Sgpt. 25, 1956 2 Sheets-Sheet 2 Filed Dec. 29, 1954 INVENTOR. HAROLD M. MAE/(O BY M,MZZ %U VW ATTORNEYS.

United States Patent DooR LATCH LOCK Harold M. Marko, Birmingham, Mich., assignor to 5055 Manufacturing Company, Detroit, Mich., a corporation of Maine Application December 29, 1954, Serial No. 478,402

4 Claims. (Cl. 292-173) This invention relates to dead locking a flush lever type of latch such as shown and described in my prior application Serial No. 467,988 on Door Latch. This door latch has a U-shaped escutcheon. The area enclosed by this U member is occupied by a plate like lever which is ordinarily closed and completely fills the space surrounded by the U-shaped border member. Hence, the whole l-atch has a pleasing appearance when used on a house door, cabinet door or similar members as contradistinguished from the knob type of latch. The bolt can be retracted against the resistance of a spring when the lever is operated either by pulling it out at the rear end or pressing it in at the front end.

Now how to provide a lock in connection with such a new type of latch was a problem. I have worked it out by providing a special form of dog which is described more in detail hereinafter.

Referring to the drawings.

Fig. 1 is a front elevation of the latch showing some of the parts on the inside in dotted lines.

Fig. 2 is a view similar to Fig. 1 but with the bolt retracting lever plate removed.

Fig. 3 is a section on the line 3-3 of Fig. 1.

Fig. 4 is a fragmentary edge view of the door equipped with the bolt and the latch casings or escutcheons.

Fig. 5 is a. section on the line 5-5 of Fig. 3.

Fig. 6 is a section on the line 66 of Fig. 3.

Fig. 7 is a sectional detail showing the rubber bumper taken on the line 77 of Fig. 2.

The bolt 1 projects from the face plate 2 which is secured to the edge of the door by screws 3. On one or both sides of the door is the latch casing 4 which on the outside takes the form of a U-shaped escutcheon with sharp corners 5. The open end 6 of the U affords space with which to grasp the panel-like lever 7 which turns on the spindle 8. The escutcheons are secured to the door and together by the long bolts 9 which reach across the entire Width of the door and screw into the sleeve 10 which is part of the escutcheon casting. 'Ihe panel-like lever turns against the resistance of spring 11 which serves to retract the bolt. The bolt has a solid metal beveled head 12 and a stamped metal shank 13. The stamped metal shank is secured to the solid head by the large rivet 14 which has a head that travels in the slot 15 of the sheet metal bolt casing 16. The panel-like retracting lever is, like the escutcheons or casings, a casting with an integral retracting arm 17 which passes into the slot 18 in the stamped metal bolt shank to retract the bolt against the resistance of the coil spring 19.

The problem is how to provide a lock for such a new setup in a way of a latch. This I have accomplished by means of providing the L-like arm 20 which at the end of the L has an elbow that provides a nub 21 that can be projected in the opening 22 in the top of the bolt guide so as to place the nub 21 behind the bolt. Compare Figs. 3, 5 and 6. This serves to lock or dog the bolt effectively so it cant be retracted either by operating one of the panel levers or trying to operate it with an implement inserted between the door and the door jamb.

This dogging lever is pivoted on the pintle 23 which is riveted on the shelf 24 which is part of the latch casing casting. This pintle has a bearing surface 24 which is about double the width of the thickness of the dogging lever and consequently the L-like arm would be loosely secured on the bearing surface of the pintle were it not for the bowed spring 25 which fits in between the head of the pintle and the lever. This allows the lever to move the resistance of the spring so that the boss or button 26 on the lever can snap into either the recess 27 or the recess 28 on shelf or bridge 24 of the latch casing casting. This, when the lever is in the open position, holds the lever open as shown in Fig. 2. When the nub snaps into recess 27 the lever is in the closed position, holding the bolt dead locked or dogged. The bridge 29 in the casting has a boss 30 which forms a recess 31. This boss is perforated to take the teat 33 of a rubber button 32. This forms a rubber stop or cushion when the bolt retracting lever is pushed or snapped to closed position.

What I claim is:

1. In a lock having a lever retracting panel flush with the latch casing, the combination of a casing forming on its outside a U-like escutcheon, a flat panel-like boltretracting lever occupying the space bounded by the U-like escutcheon and flush with the top of the escutcheon, a face plate and bolt guide with an opening in the top, a bolt longitudinally movable in the bolt guide, a spring for normally keeping the bolt head projected, the casing having a shelf, and L-shaped dogging lever pivoted on said shelf and provided at the end of the L-shaped lever with a nub that can pass into said opening in the bolt guide to lie behind the inner end of the bolt shank to dog the bolt when the lever is at one end of its throw and to be in a position to release the bolt when the lever is at the other end of its throw.

2. The combination claimed in claim 1 in which the whole dogging lever in the non-locking position is concealed under the panel-like retracting lever but in the locking position projects slightly beyond the lever to give notice of the locked condition.

3. The combination claimed in claim 1 in which the shelf has a pair of recesses at each end of the arc of travel of the lever and the dogging lever has a boss and in which the lever is loosely pivoted so as to be able to move axially of the pivot pin and a spring pressing on the lever at the pivot for the purpose of giving it a spring thrust to snap the boss on the lever into either of the recesses to keep it in one position or the other of locking or unlocking.

4. The combination claimed in claim 1 in which the shelf is in the form of an integral bridge reaching from one leg of the U-like escutcheon casting to the other leg.

References Cited in the file of this patent UNITED STATES PATENTS 1,035,073 Augenbraun Aug. 6, 1912 1,989,801 Halinka Feb. 5, 1935 2,055,688 Halinka Sept. 29, 1936 2,642,300 Pelcin June 16, 1953 2,649,322 Mack Aug. 18, 1953 2,697,626 Cheney Dec. 21, 1954 

